<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			[class*="col"]{
				border: 1px solid #ffffff;
				background-color: #eee;
			}
		</style>
		<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
		<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
		
		<!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
		<link rel="stylesheet" 
		href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap-theme.min.css" 
		integrity="sha384-6pzBo3FDv/PJ8r2KRkGHifhEocL+1X2rVCTTkUfGk7/0pbek5mMa1upzvWbrUbOZ"
		 crossorigin="anonymous">
		
		<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
		<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
	</head>
	<body>
		<div class="container">
			<div class="row">
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			  <div class="col-md-1">.col-md-1</div>
			</div>
			<div class="row">
			  <div class="col-md-8">.col-md-8</div>
			  <div class="col-md-4">.col-md-4</div>
			</div>
			<div class="row">
			  <div class="col-md-4">.col-md-4</div>
			  <div class="col-md-4">.col-md-4</div>
			  <div class="col-md-4">.col-md-4</div>
			</div>
			<div class="row">
			  <div class="col-md-6">.col-md-6</div>
			  <div class="col-md-6">.col-md-6</div>
			</div>
			
			
			<!-- Stack the columns on mobile by making one full-width and the other half-width -->
			<div class="row">
			  <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>
			  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
			</div>
			
			<!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
			<div class="row">
			  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
			  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
			  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
			</div>
			
			<!-- Columns are always 50% wide, on mobile and desktop -->
			<div class="row">
			  <div class="col-xs-6">.col-xs-6</div>
			  <div class="col-xs-6">.col-xs-6</div>
			</div>
			
			
		</div>
		
	</body>
</html>